EP1444161B1 - Hoistway access detection system - Google Patents
Hoistway access detection system Download PDFInfo
- Publication number
- EP1444161B1 EP1444161B1 EP02773611A EP02773611A EP1444161B1 EP 1444161 B1 EP1444161 B1 EP 1444161B1 EP 02773611 A EP02773611 A EP 02773611A EP 02773611 A EP02773611 A EP 02773611A EP 1444161 B1 EP1444161 B1 EP 1444161B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hoistway
- safety chain
- open
- door
- car
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
- B66B13/22—Operation of door or gate contacts
Definitions
- This invention relates to a method and apparatus for improving elevator safety and more particularly for detecting intrusion into an elevator hoistway.
- Objects of the invention include an improved method and apparatus for detecting the presence of an unauthorized person in the hoistway.
- a first safety chain is formed from the door sensors from the landings of the even numbered floors.
- a second safety chain is formed from the door sensors from the odd numbered floors and a third safety chain is formed from the door sensor from the pit door, which provides access to the pit at the bottom of the hoistway. In some elevator installations the bottom landing door also provides access to the pit.
- the first, second, and third safety chains are monitored by software or logic located in the elevator controller. Depending on the status of the elevator car and safety chains the controller will allow the car to operate normally or stop the car and direct it to a nearest floor. The car will remain there until the controller receives a reset signal.
- the controller will determine if the car is moving in normal operation and a landing door is open. If both conditions are satisfied, the controller will stop the car. The logic will then proceed to determine if either the pit door or another landing door above the car top is open. If either condition is satisfied the car will stop and after the door is closed, proceed to a landing, at low speed, and stop to allow passengers to exit. The car will remain there until a reset signal is received and the open pit and/or landing doors are closed. The car will then resume normal operation.
- Fig. 1 is a schematic of the subject invention according to a preferred embodiment.
- Fig. 2 is high level flow diagram of the monitoring logic for the subject invention.
- a hoistway detection system 10 includes a pit landing door 12 and a series of landing doors 14 associated with each landing of the hoistway 16.
- door sensor 20 Associated with the pit door 12 is door sensor 20, to determine whether the door is open of closed.
- Door sensors 18 monitor whether each associated landing door 14 is open or closed.
- Each sensor 18 and 20 is wired in series in one of three safety chains 28, 30, and 32.
- the first safety chain 28 includes the sensors 18 for the even numbered floors i.e. Pit+2 and Pit+4.
- the second safety chain 30 includes the sensors 18 for the odd numbered floors i.e. Pit+1 - Pit+5 and the third safety chain 32 includes the pit door sensor 20.
- the most likely reason for two landing doors 14 to be open is to gain access to the top of the car 24, or pit 17 located at the bottom of the hoistway 16.
- the pit 17 is illustrated as having its own door 12 for access. However the pit area simply refers to the bottom of the hoistway and may be accessible by ladder from the lowest landing, or simply through the lowest landing. Therefore if the elevator 24 is stopped at an even number floor a person trying to gain access to the top of the car 24 would open the door one floor above, which is an odd numbered floor. By wiring the even and odd numbered floors in two separate chains the logic 100 can detect someone trying to gain unauthorized access to the top of the car 24. Unauthorized access to the pit 17 can be detected in much the same manner. By having a separate safety chain 32 for the pit unauthorized entry can be determined by detecting an open landing door 14 and the pit door 12 being open at the same time.
- the controller 22 monitors each safety chain 28, 30, and 32 performing the logic functions as shown in Fig. 2.
- the monitoring subroutine 100 begins at step 102 with the controller monitoring the signals from the landing 18 and pit sensors 20 via the first 28, second 30, and third 32 safety chains and movement of the elevator car 24 within the hoistway 16.
- step 104 the logic determines whether any of the landing doors 14 or pit door 12 are open. If any door 14 or 12 is open either the first 28, second 30 or third 32 safety chain will be broken. If no door is open then no one can enter the hoistway and the logic returns to step 102. If either the first 28, second 30 or third 32 safety chain is broken, indicating a landing door 14 or pit door 12 is open, the logic proceeds to step 106. For this example it is assumed that the door Pit+2 is open which results in a break in the first safety chain 28.
- the logic determines whether the elevator 24 is moving. If the car 24 is moving then someone may gain unauthorized access to the hoistway 16. Therefore the logic moves to step 108 where the elevator car 24 is stopped from further movement.
- step 110 determines if the pit door 12 is open, which would result in a break in the third safety chain 32. If the pit door 12 is open then the logic proceeds to step 112 and the controller 22 directs car 24 to an altemate landing, at low speed, to allow passengers exit the elevator 24. The car 24 remains at this landing until a reset signal 34 is received by the controller 22 from an external switch 26.
- step 114 determines if the other safety chain (in this example the second safety chain 30) is open. If the second safety chain 30 is broken then the logic proceeds to step 112 and the elevator car 24 is directed to an alternate landing, at low speed, to allow passengers to exit the elevator car 24. If neither the second 30 nor third 32 safety chains are broken the car 24 remains stopped and the logic returns to step 102 to repeat the process. Once the door is closed the elevator returns to normal operation.
- the other safety chain in this example the second safety chain 30
- step 104 determines, at step 104, whether a landing door 14 is open and then proceeds to step 106 to determine if the elevator car 24 is stopped at a landing 14. If these two conditions are satisfied the logic proceeds to step 110 to determine if the third safety chain 32 is open. If the third safety chain 32 is open, indicating the pit door 12 is open, then the logic proceeds to step 112. The elevator will remain in this stopped position until the controller 22 receives a reset signal 34 by way of an external switch 26.
- the reset signal 34 could originate from a switch on the controller, a pit switch or other appropriate signal.
- step 114 the logic proceeds to step 114 to detect whether a door above the car is open. Assuming the car is stopped at an odd numbered floor the logic would determine if the first safety chain 28 is broken. This would indicate, for the present example, that one of the even numbered floors is open. If a door 14 of an even numbered floor is open, the logic would then proceed to step 112. The car 24 would remain at this landing until an external reset signal 34 is received. If neither the pit door 12, associated with the third safety chain 32, or a landing door 14 associated with the first safety chain 28, is open then the logic returns to step 102 and the process is repeated.
Landscapes
- Elevator Door Apparatuses (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Elevator Control (AREA)
Description
- This invention relates to a method and apparatus for improving elevator safety and more particularly for detecting intrusion into an elevator hoistway.
- Persons that enter a hoistway, such as mechanics, maintenance personnel, and unauthorized persons may be injured by sudden unexpected movement of the elevator car. The condition of hoistway doors and elevator doors are constantly monitored to ensure that authorized personnel follow safety procedures when entering the hoistway and that no car movement is allowed upon entry of unauthorized personnel.
- It is known in the prior art to monitor the switches on each landing door and the car door to determine if the doors are closed. The door switches from each door are normally wired in series to form a safety chain. High speed movement of the car is prevented whenever one of the doors is open. The car is allowed to resume normal operation when the doors are closed and the safety chain is made.
- However, there exists a problem in the prior art in that if the elevator door and the corresponding landing door are open to allow passengers to enter or exit the car the safety chain is broken. A second open landing door cannot be detected. Therefore someone could enter the pit area at the bottom of the hoistway or step onto the top of the car from a landing above while the car is stopped for normal operation. Once all the doors are closed the elevator will resume normal operation which could result in injury to person above the car or in the pit.
- Therefore there exists a need for an improved method and apparatus for detecting the presence of an unauthorized person entering the hoistway.
- Objects of the invention include an improved method and apparatus for detecting the presence of an unauthorized person in the hoistway.
- According to the present invention, a first safety chain is formed from the door sensors from the landings of the even numbered floors. A second safety chain is formed from the door sensors from the odd numbered floors and a third safety chain is formed from the door sensor from the pit door, which provides access to the pit at the bottom of the hoistway. In some elevator installations the bottom landing door also provides access to the pit.
- The first, second, and third safety chains are monitored by software or logic located in the elevator controller. Depending on the status of the elevator car and safety chains the controller will allow the car to operate normally or stop the car and direct it to a nearest floor. The car will remain there until the controller receives a reset signal.
- If no landing doors are open then there can be no entry to the hoistway. Therefore the controller will continue to monitor the status of three safety chains and allow normal operation.
- In a first scenario, the controller will determine if the car is moving in normal operation and a landing door is open. If both conditions are satisfied, the controller will stop the car. The logic will then proceed to determine if either the pit door or another landing door above the car top is open. If either condition is satisfied the car will stop and after the door is closed, proceed to a landing, at low speed, and stop to allow passengers to exit. The car will remain there until a reset signal is received and the open pit and/or landing doors are closed. The car will then resume normal operation.
- In a second scenario with the car stopped at a landing and the corresponding landing door open, the car will remain stopped upon detection of either an open pit door or an open door above the car. The elevator will be allowed to return to normal operation upon detection of a reset signal.
- Fig. 1 is a schematic of the subject invention according to a preferred embodiment.
- Fig. 2 is high level flow diagram of the monitoring logic for the subject invention.
- According to the present invention, a
hoistway detection system 10 includes apit landing door 12 and a series oflanding doors 14 associated with each landing of thehoistway 16. Associated with thepit door 12 isdoor sensor 20, to determine whether the door is open of closed.Door sensors 18 monitor whether each associatedlanding door 14 is open or closed. Eachsensor safety chains first safety chain 28 includes thesensors 18 for the even numbered floors i.e. Pit+2 and Pit+4. Thesecond safety chain 30 includes thesensors 18 for the odd numbered floors i.e. Pit+1 - Pit+5 and thethird safety chain 32 includes thepit door sensor 20. - The most likely reason for two
landing doors 14 to be open is to gain access to the top of thecar 24, orpit 17 located at the bottom of thehoistway 16. Thepit 17 is illustrated as having itsown door 12 for access. However the pit area simply refers to the bottom of the hoistway and may be accessible by ladder from the lowest landing, or simply through the lowest landing. Therefore if theelevator 24 is stopped at an even number floor a person trying to gain access to the top of thecar 24 would open the door one floor above, which is an odd numbered floor. By wiring the even and odd numbered floors in two separate chains thelogic 100 can detect someone trying to gain unauthorized access to the top of thecar 24. Unauthorized access to thepit 17 can be detected in much the same manner. By having aseparate safety chain 32 for the pit unauthorized entry can be determined by detecting anopen landing door 14 and thepit door 12 being open at the same time. - The
controller 22 monitors eachsafety chain monitoring subroutine 100 begins atstep 102 with the controller monitoring the signals from thelanding 18 andpit sensors 20 via the first 28, second 30, and third 32 safety chains and movement of theelevator car 24 within thehoistway 16. - At
step 104 the logic determines whether any of thelanding doors 14 orpit door 12 are open. If anydoor step 102. If either the first 28, second 30 or third 32 safety chain is broken, indicating alanding door 14 orpit door 12 is open, the logic proceeds tostep 106. For this example it is assumed that the door Pit+2 is open which results in a break in thefirst safety chain 28. Atstep 106 the logic determines whether theelevator 24 is moving. If thecar 24 is moving then someone may gain unauthorized access to thehoistway 16. Therefore the logic moves tostep 108 where theelevator car 24 is stopped from further movement. - The logic then proceeds to
step 110 to determine if thepit door 12 is open, which would result in a break in thethird safety chain 32. If thepit door 12 is open then the logic proceeds to step 112 and thecontroller 22 directscar 24 to an altemate landing, at low speed, to allow passengers exit theelevator 24. Thecar 24 remains at this landing until areset signal 34 is received by thecontroller 22 from anexternal switch 26. - If the
pit door 12 is not open then the logic proceeds tostep 114 to determine if the other safety chain (in this example the second safety chain 30) is open. If thesecond safety chain 30 is broken then the logic proceeds to step 112 and theelevator car 24 is directed to an alternate landing, at low speed, to allow passengers to exit theelevator car 24. If neither the second 30 nor third 32 safety chains are broken thecar 24 remains stopped and the logic returns to step 102 to repeat the process. Once the door is closed the elevator returns to normal operation. - In a second scenario where someone may be trying to gain unauthorized access to the top of the
elevator car 24 or to thepit 17. The logic first determines, atstep 104, whether a landingdoor 14 is open and then proceeds to step 106 to determine if theelevator car 24 is stopped at alanding 14. If these two conditions are satisfied the logic proceeds to step 110 to determine if thethird safety chain 32 is open. If thethird safety chain 32 is open, indicating thepit door 12 is open, then the logic proceeds to step 112. The elevator will remain in this stopped position until thecontroller 22 receives areset signal 34 by way of anexternal switch 26. Thereset signal 34 could originate from a switch on the controller, a pit switch or other appropriate signal. - If the
third safety chain 32 is not broken then the logic proceeds to step 114 to detect whether a door above the car is open. Assuming the car is stopped at an odd numbered floor the logic would determine if thefirst safety chain 28 is broken. This would indicate, for the present example, that one of the even numbered floors is open. If adoor 14 of an even numbered floor is open, the logic would then proceed to step 112. Thecar 24 would remain at this landing until anexternal reset signal 34 is received. If neither thepit door 12, associated with thethird safety chain 32, or alanding door 14 associated with thefirst safety chain 28, is open then the logic returns to step 102 and the process is repeated. - The foregoing description is exemplary rather than defined by the limitations within. Many modifications and variations of the present invention are possible in light of the above teachings. The preferred embodiments of this invention have been disclosed, however, one of ordinary skill in the art would recognize that certain modifications would come within the scope of this invention. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described. For that reason the following claims should be studied to determine the true scope and content of this invention.
Claims (8)
- A method for detecting intrusion into a hoistway (16) of elevator, the hoistway including multiple landing door (14), door sensors (18) at each landing for monitoring the position of the landing doors, the hoistway being adapted for movement of an elevator car (24) therein, the hoistway further including a first safety chain (28) comprising outputs from the door sensor (18) from the even numbered landings electrically connected in series, and a second safety chain (30) comprising outputs from the door sensors from the odd numbered landings electrically connected in series, the method for detecting comprising:determining whether said first safety chain is open;determining whether said second safety chain is open; andexecuting a hoistway detection mode wherein said elevator car is prevented from moving upon the determination that said first safety chain, and said second safety chain are open.
- The method of claim 1 wherein the hoistway (16) further includes a third safety chain (32) comprising the output from a pit door sensor (12) the method comprising;determining whether the third safety chain is open; andexecuting the hoistway detection mode upon a determination that the third safety chain is open and either the first or second safety chain (28, 30) is open.
- The method of claim 1 or 2 further comprising:detecting whether the elevator car (24) is moving; andexecuting the hoistway detection mode upon the determination that said first or second safety chain (28, 30) is open and said car is moving.
- The method 1, 2 or 3 said hoistway detection method further comprising:moving said car (24) to a landing to release any passengers in the car prior to ceasing movement.
- The method of any preceding claim further comprising:resuming normal operation upon receipt of a reset command.
- A detection system for a hoistway (16), the hoistway including multiple landing doors (14), door sensors (18) at each landing for monitoring the position of the landing doors, the hoistway being adapted for movement of an elevator car (24) therein, the detection system comprising:a first safety chain (28) comprising outputs from the door sensors from the even numbered landings electrically connected in series;a second safety chain (30) comprising outputs from the door sensors from the odd numbered landings electrically connected in series; anda controler (22) for monitoring the first and second safety chains and for controlling movement of the elevator car within the hoistway, said controller executing a hoistway detection mode wherein said elevator car is prevented from moving upon a determination that the first and second safety chains are open.
- The hoistway detection system of claim 6 wherein said controller (22) causes said elevator car (24) move at slow speed to a landing upon a determination that the car is moving.
- The hoistway detection system of claim 6 or 7 wherein the hoistway (16) further includes , a pit (17) located at the bottom of the hoistway having a pit door (12) providing access thereto, the pit door position being monitored by a pit door sensor (20), the system further comprising a third safety chain (32) comprising the output from the pit door sensor wherein the controller (22) executes the hoistway detection mode upon a determination that the first or second safety chain (28, 30) is open and the third safety chain (32) is open.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/991,444 US6603398B2 (en) | 2001-11-16 | 2001-11-16 | Hoistway access detection system |
US991444 | 2001-11-16 | ||
PCT/US2002/030721 WO2003043928A1 (en) | 2001-11-16 | 2002-09-24 | Hoistway access detection system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1444161A1 EP1444161A1 (en) | 2004-08-11 |
EP1444161B1 true EP1444161B1 (en) | 2006-02-08 |
Family
ID=25537220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02773611A Expired - Fee Related EP1444161B1 (en) | 2001-11-16 | 2002-09-24 | Hoistway access detection system |
Country Status (6)
Country | Link |
---|---|
US (1) | US6603398B2 (en) |
EP (1) | EP1444161B1 (en) |
JP (1) | JP4177258B2 (en) |
KR (1) | KR100899935B1 (en) |
CN (1) | CN1298608C (en) |
WO (1) | WO2003043928A1 (en) |
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US10636272B2 (en) | 2018-09-26 | 2020-04-28 | Otis Elevator Company | Time domain reflectometry for electrical safety chain condition based maintenance |
US10889465B2 (en) | 2017-07-31 | 2021-01-12 | Otis Elevator Company | Mechanical hoistway access control device |
US11040853B2 (en) | 2015-05-07 | 2021-06-22 | Otis Elevator Company | Elevator system hoistway access control |
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ES2258638T3 (en) * | 2001-07-09 | 2006-09-01 | Inventio Ag | ELEVATOR INSTALLATION WITH VIRTUAL PROTECTION AREA AT THE FOOT OF THE HOLLOW AND / OR IN THE HEAD OF THE HOLLOW AND PROCEDURE FOR THE CONTROL OF THE SAME. |
JP4527362B2 (en) * | 2002-05-03 | 2010-08-18 | インベンテイオ・アクテイエンゲゼルシヤフト | Elevator shaft door monitoring method |
FR2842512B1 (en) * | 2002-07-16 | 2005-07-22 | Jean Patrick Azpitarte | SYSTEM FOR SECURING THE OPERATION OF THE BEARING DOORS OF AN ELEVATOR |
DE50306235D1 (en) * | 2003-04-30 | 2007-02-15 | Thyssenkrupp Elevator Ag | EQUIPMENT AND METHOD FOR CONTROLLING AN ELEVATOR |
WO2005118453A1 (en) * | 2004-06-03 | 2005-12-15 | Otis Elevator Company | Elevator hoistway access detection |
ATE505423T1 (en) * | 2004-12-21 | 2011-04-15 | Otis Elevator Co | ELEVATOR SAFETY SYSTEMS |
WO2007018540A1 (en) * | 2005-08-08 | 2007-02-15 | Otis Elevator Company | Warning system for mechanics in elevator hoistways |
WO2007040538A1 (en) * | 2005-10-05 | 2007-04-12 | Otis Elevator Company | Elevator system control responsive to hoistway access detection |
KR101025064B1 (en) * | 2006-11-20 | 2011-03-25 | 미쓰비시덴키 가부시키가이샤 | Elevator system |
FI125141B (en) * | 2007-01-03 | 2015-06-15 | Kone Corp | Elevator safety device |
FI20070486A (en) * | 2007-01-03 | 2008-07-04 | Kone Corp | Elevator security |
ES2575097T3 (en) | 2007-12-03 | 2016-06-24 | Otis Elevator Company | Passive detection of people in elevator elevator shaft |
EP2072450A1 (en) * | 2007-12-21 | 2009-06-24 | Inventio Ag | Circuit for resetting an elevator safety chain |
FI121423B (en) * | 2009-04-23 | 2010-11-15 | Kone Corp | Safety arrangement for a lift |
US8256581B2 (en) * | 2009-09-30 | 2012-09-04 | Inventio Ag | Landing door proximity warning system |
KR101481568B1 (en) | 2010-09-13 | 2015-01-13 | 오티스 엘리베이터 컴파니 | Elevator safety system and method |
WO2012105008A1 (en) * | 2011-02-02 | 2012-08-09 | 三菱電機株式会社 | Safety control device for elevator |
EP2697146B1 (en) | 2011-04-15 | 2020-10-21 | Otis Elevator Company | Elevator drive power supply control |
CN103842277B (en) | 2011-10-06 | 2016-04-13 | 奥的斯电梯公司 | Elevator brake controls |
JP5859023B2 (en) * | 2011-12-05 | 2016-02-10 | 三菱電機株式会社 | Elevator safety control device |
US10106374B2 (en) * | 2014-04-14 | 2018-10-23 | Inventio Ag | Method for operating an elevator system and an elevator control device operating in accordance with the method |
US10392227B2 (en) | 2014-07-25 | 2019-08-27 | Otis Elevator Company | Elevator system maintenance from inside a car of the elevator system |
EP3012217B8 (en) * | 2014-10-21 | 2017-08-02 | KONE Corporation | Safety system for elevator |
AU2016320400B2 (en) | 2015-09-11 | 2019-08-29 | Inventio Ag | Device and method for monitoring a maintenance mode of an elevator installation |
BR102016024614A2 (en) * | 2015-10-22 | 2017-05-02 | Otis Elevator Co | elevator system and maintenance safety assembly |
CN106494959B (en) * | 2016-12-06 | 2018-11-13 | 宁波永良电梯技术发展有限公司 | The control method of elevator device |
EP3357851B1 (en) * | 2017-02-06 | 2023-08-02 | KONE Corporation | Mechanism for improving safety for an elevator system |
EP3418238B1 (en) | 2017-06-22 | 2020-07-08 | Otis Elevator Company | Elevator lintel door lock safety devices |
EP3814267B1 (en) * | 2018-06-29 | 2022-07-06 | Inventio AG | Safety switch system and method for switching a lift assembly between normal and inspection mode |
EP3653556B1 (en) | 2018-11-15 | 2023-05-10 | KONE Corporation | Resetting an elevator shaft access monitoring system |
JP7024917B2 (en) * | 2019-06-27 | 2022-02-24 | 三菱電機株式会社 | Elevator system |
CN117905383A (en) * | 2024-03-19 | 2024-04-19 | 菱王电梯有限公司 | Automatic pit climbing device, control method and device thereof and elevator system |
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-
2001
- 2001-11-16 US US09/991,444 patent/US6603398B2/en not_active Expired - Lifetime
-
2002
- 2002-09-24 KR KR1020047006662A patent/KR100899935B1/en not_active IP Right Cessation
- 2002-09-24 CN CNB028226542A patent/CN1298608C/en not_active Expired - Fee Related
- 2002-09-24 EP EP02773611A patent/EP1444161B1/en not_active Expired - Fee Related
- 2002-09-24 JP JP2003545575A patent/JP4177258B2/en not_active Expired - Fee Related
- 2002-09-24 WO PCT/US2002/030721 patent/WO2003043928A1/en active IP Right Grant
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11040853B2 (en) | 2015-05-07 | 2021-06-22 | Otis Elevator Company | Elevator system hoistway access control |
US10889465B2 (en) | 2017-07-31 | 2021-01-12 | Otis Elevator Company | Mechanical hoistway access control device |
US10636272B2 (en) | 2018-09-26 | 2020-04-28 | Otis Elevator Company | Time domain reflectometry for electrical safety chain condition based maintenance |
Also Published As
Publication number | Publication date |
---|---|
KR100899935B1 (en) | 2009-05-28 |
US20030094332A1 (en) | 2003-05-22 |
CN1298608C (en) | 2007-02-07 |
JP2005509581A (en) | 2005-04-14 |
EP1444161A1 (en) | 2004-08-11 |
JP4177258B2 (en) | 2008-11-05 |
CN1585723A (en) | 2005-02-23 |
KR20040053256A (en) | 2004-06-23 |
WO2003043928A1 (en) | 2003-05-30 |
US6603398B2 (en) | 2003-08-05 |
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